58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
/*
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* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <openssl/rc4.h>
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#include "rc4_locl.h"
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#include <openssl/opensslv.h>
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const char *RC4_options(void)
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{
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if (sizeof(RC4_INT) == 1)
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return ("rc4(char)");
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else
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return ("rc4(int)");
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}
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/*-
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* RC4 as implemented from a posting from
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* Newsgroups: sci.crypt
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* From: sterndark@netcom.com (David Sterndark)
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* Subject: RC4 Algorithm revealed.
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* Message-ID: <sternCvKL4B.Hyy@netcom.com>
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* Date: Wed, 14 Sep 1994 06:35:31 GMT
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*/
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void RC4_set_key(RC4_KEY *key, int len, const unsigned char *data)
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{
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register RC4_INT tmp;
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register int id1, id2;
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register RC4_INT *d;
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unsigned int i;
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d = &(key->data[0]);
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key->x = 0;
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key->y = 0;
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id1 = id2 = 0;
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#define SK_LOOP(d,n) { \
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tmp=d[(n)]; \
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id2 = (data[id1] + tmp + id2) & 0xff; \
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if (++id1 == len) id1=0; \
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d[(n)]=d[id2]; \
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d[id2]=tmp; }
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for (i = 0; i < 256; i++)
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d[i] = i;
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for (i = 0; i < 256; i += 4) {
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SK_LOOP(d, i + 0);
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SK_LOOP(d, i + 1);
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SK_LOOP(d, i + 2);
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SK_LOOP(d, i + 3);
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}
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}
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